The dark-blue number is a low-key look for the duchess, who is known to put her own spin on royal style, to sometimes controversial results. Her more traditional look may have been an attempt to stay out of the spotlight on Eugenie's big day, while still wearing something new.

Kate Middleton went with a similar approach for Markle's wedding in May by re-wearing one of her previous looks, but she took a very different fashion route for Eugenie's wedding by debuting an eye-catching, bold pink dress by Alexander McQueen.